glibc: fix header file conflict in case of multilib

glibc: fix header file conflict in case of multilib

When enabling multilib for qemuarm64, populate_sdk would fail with
the following error:

  Error: Transaction test error: file /usr/include/bits/indirect-return.h
  conflicts between installs of lib32-libc6-dev-2.41 and libc6-dev-2.41+

The problem could be reproduced by adding the following lines in
local.conf and then run 'bitbake core-image-minimal -c populate_sdk':

  MACHINE ?= "qemuarm64"
  require conf/multilib.conf
  MULTILIBS ?= "multilib:lib32"
  DEFAULTTUNE:virtclass-multilib-lib32 ?= "armv7athf-neon"

Use oe_multilib_header to handle bits/indrect-return.h to fix this
issue.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>